如何通过zxing-android-embedded在Android中停止连续扫描

Question

我正在使用 Zxing-android-embedded(https://github.com/journeyapps/zxing-android-embedded) 来扫描二维码。我已经从 github 导入了库。当应用程序启动时，只要将相机放在条形码上，相机就会重复扫描代码。我想停止扫描（但不是相机预览）一旦检测到条形码并显示一个带有“确认”按钮、“取消”按钮和一个输入框的对话框。当用户按下“确认”或“取消”按钮时，它应该再次开始扫描。

我在 decode() 方法的开头调用了barcodeView.pause();，它暂停了相机预览。此外，在“dialogConfirmClick”和“dialogCancelClick”的onClick方法中添加了barcodeView.resume();。但是barcodeView.pause(); 方法会暂停扫描以及相机预览。

这是我的课-

public class MyScanActivity extends Activity {
    private static final String TAG = MyScanActivity.class.getSimpleName();

    private CompoundBarcodeView barcodeView;
    private BeepManager beepManager;
    private DialogInterface.OnClickListener dialogCanselClick;
    private AlertDialog dialog;

    private BarcodeCallback callback = new BarcodeCallback() {
        @Override
        public void barcodeResult(BarcodeResult result) {
            if (result.getText() != null) {
                handleDecode(result);
            }
        }

        @Override
        public void possibleResultPoints(List<ResultPoint> resultPoints) {
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.continuous_scan);
        barcodeView = (CompoundBarcodeView) findViewById(R.id.barcode_scanner);
        barcodeView.decodeContinuous(callback);
        beepManager = new BeepManager(this);
        dialogCancelClick = new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                barcodeView.resume();//Resume scanning 
                dialog.dismiss();
            }
        };
    }

    public void handleDecode(BarcodeResult rawResult) {
        barcodeView.pause();//Pause preview
        String result = rawResult.getText();

        beepManager.playBeepSoundAndVibrate();

        DialogInterface.OnClickListener dialogOkClick = new DialogInterface.OnClickListener() { // OK
            // button
            @Override
            public void onClick(DialogInterface dialog, int which) {

                if (writeNote) {
                    EditText txtNote = (EditText) promptsView.findViewById(R.id.txt_dialog_note);
                    //code to merge value of txtNote with result
                }

                dialog.dismiss();
                barcodeView.resume();//Resume scanning after pressing confirm button
                Toast.makeText(MyScanActivity.this, R.string.dialog_save_qr_alert, Toast.LENGTH_SHORT).show();
            }
        };

        AlertDialog dialog = DialogHelper.CreateDialog(this, DialogHelper.SAVE_QR_CODE, result, dialogOkClick, dialogCancelClick, promptsView);
        dialog.show();
    } 

    @Override
    protected void onResume() {
        super.onResume();

        barcodeView.resume();
    }

    @Override
    protected void onPause() {
        super.onPause();

        barcodeView.pause();
    }

    public void pause(View view) {
        barcodeView.pause();
    }

    public void resume(View view) {
        barcodeView.resume();
    }

    public void triggerScan(View view) {
        barcodeView.decodeSingle(callback);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return barcodeView.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
    }
}

Answer 1

我已经找到了解决方案。我发布这个是为了帮助其他可能有同样疑问的人。

不要在 onCreate 方法中使用barcodeView.decodeContinuous(callback);，而是使用barcodeView.decodeSingle(callback);。一旦找到二维码，它将停止扫描。在 Confirm 和 Cancel 按钮内调用 barcodeView.decodeSingle(callback); 以再次激活扫描。